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Mortgage Loans - Loan Commitments and Related Derivatives Textual (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2,700.0 | $ 4,000.0
Best-efforts whole loan delivery commitments [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 18.9 | 23.5
Hedging Instruments Related To IRLCs [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2,600.0 | $ 3,800.0

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